Screening-grinder.



E. OBRIEN & E. OBRIEN, JR.

SCREENING GRINDER. APPLICATION FILED oo'r. 19,1908.

2 BHEETS8HEBT 1.

' a we a I g" //g Patented Sept. 14, 1909.

E. O'BRIEN & H. 043mm, JR. SCREENING GRINDER.

APPLICATION FILED vOUT. 19, 1908.

933 780, Patented Sept. 14. 1909.

' 2 SHEETS-SHEET 2.

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UNITED STATES PATENT oEEIoE.

EUGENE OBRIEN AND EUGENE OBRIEN, JR., OE EAU CLAIRE; WISCONSIN.

SCREENING-GRINDER.

' Specification of Letters Patent. Patented Sept. 14;, 1909. Application filed October 19, 1908. Serial No. 458,495.

To all whom it may concern:

Be it known that we, EUGENE OBRIENifiHd EUGENE OBRIEN, Jr., both citizens of the United States, and residents of Eau Claire, in the county of Eau Wisconsin, have invented a new and useful Screening-Grinder; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention consists arities of construction and combinatlon of parts hereinafter particularly set forth with reference to the accompanying drawings and pointed out in claim; its object being to provide machines of the species aforesaid that may be employed to successfully grind pulp-mill screenings, tailings and other heretofore waste material, in order that the same may be utilized in the production of pulpboard, various grades of wrapping-papers or car-lining papers and other marketable material.

Figure'l of the drawings represents a vertical longitudinal section of a grinder embodyin our improvements; Figs. 2 and 3 vertieaftransverse section views respectively indicated by lines 2-2 and 3-3 in Fi 1; Fig. 4, a similar view of a fragment of the shell and plug of the grinder; and Fig. 5, a diagram illustrating a preferred arrangement of knives in-sald shell.

Referring by letter to the drawings, A indicates the conical shell, B the conical core and C the core-sha ft of the grinder. To provide for accurate centering of the core in the shell, so as to obtain the best results and highest eflieiency of the engine, the coreshaft is run in adjustable bearings, each of which comprises a separable box having the underside of its block section D notched to fit upon spacers I) set in the pillow-block E for said bearing in opposition to screws 0 that turn in said pillow-block. By means of the screws, the bearings aforesaid are readily adjusted for the purpose stated.

The shell and core are studded with knives suitably spaced, these lmives being also suitably keyed and locked in place.

Claire and State of in certain peculi- It is preferv I able in our grinder to employ three sets of knives in the shell. The first set of knives d are approximately one inch apart, the second set of knives e approximately three-' the third set of eighths of an inch apart and knives f approximately one-quarter of an inch apart.

the knives of each set in the shell in tangent series in opposite cumferentially of said shell. interval between knives in sets throughout the shell provision is had for radual reduction of material fed to the grinder, whereby we obtain the best results with the least expenditure of power. The knives g of the core run the full length of said core at suitable intervals apart and are preferably tapered at the back end to obtain clearance for material fed to the grinder. Other knives h of the core alternate with the ones 9 in opposition to the knives e, f, of the shell to assist in the'gradual reduction of fed material and saving in power as aforesaid. The shell is extended back of its feed opening '11 and the core to form a cylindrical chamber for a pro eller F fast on the coreshaft, this propel er being preferably of bronze and pitched. in such a manner as to constantly force the fed material into the cutting portion of the grinder, this being the important feature of our invention.

We claim:

A screening grinder having the shell thereof extended back of its feed-inlet to form a cylindrical chamber, and a propeller fast on the core-shaft of the v grinder within said chamber.

directions from a line cir-.

By varying the In testimony that we claim the foregoing of Wisconsin in the presence of two witnesses.

EUGENE OBRIEN. EUGENE OBRIEN, J R. Witnesses: M

J -A. STILP, E. L. HOLDEN.

As shown in Fig. 5, it is preferable to have I 

